Blowtorch



I H. l.. FISH Feb. v17. 1925.

'BLowToRcH Filed July 50, 1923 SH01/nuja i Patented Feb. 17, 1925.

UNITED STATES PATENT OFFICE.

HERBERT L. FISI-I, 0F SPRINGFIELD, OHIO, .ASSIGNOR T0 HARRY C. DOWNEY,0F SPRINGFIELD, OHIO.

BLOWTORCH.

Application filed July 30, 1923. Serial No. 654,596.

To all whom t may concern:

Be it known that I, HERBERT L. F ISH, a citizen of the United States,residing at 'Springfield in the county of Clark and State of Ohio, haveinvented certain new and useful Improvements in Blowtorches, of whichthe following is a specification.

This invention relates to improvements in blow torches.

The object of the invention is to provide a torch which will be simpleand economical in construction and efhcient in operation.

Referring to the drawings: Fig. 1 is a top plan view of a torchembodying the improvements. Fig. 2 is a side elevation. Fig. 3 is asection on the line 3-3 of Fi 1.

lieferring to the drawings, 1 represents the fuel tank, the head ofwhich has a hollow extension, indicated in dotted lines at 2, whichprojects a suitable distance into the interior of the tank and is closedby a plug 3 at its outer end; this extension forming the fuel openingfor the tank and also providing for a pressure of air in the tank wheniilled in a well known way. The main body of the generator is indicatedatll and is supported upon a tripod the head 5 of which has a reducedupwardly-projecting extension 6 terminating in a short stem 7 screwedinto the body of the generator. A sleeve 8 is placed about the extension6 and secured thereto by a set-screw 9, this sleeve having integrallyformed therewith a cupshaped portion 10 to receive a supply of gasolineor other fuel to preliminarily heat the generator. A pipe 11 extendsfrom the tank to the generator body, being fitted in an integralextension 12 projecting forwardly from the body 4. The main body of thegenerator has a horizontal passage Way 13 communicating with the pipe 11at one end and having a reduced orifice 14 at the opposite end which iscontrolled by a valve 15 which is threaded in an extension 16 of thebody Il, .the interior of this eX- tension being threaded to receive apacking gland 16. Proiocti1M upwardly from the main body 4 is a thirdintegral extension 17 which `has therein an inverted L-shapedpassageway, the vertical portion 18 of which communicates with theorifice 14:. The horizontal portion 19 of this passage has its rear endclosed by cap 20 and its other end communicating with a reduced orice 21which forms an outlet to a tube 22 which has its rear end threaded intoan integral extension of the main body e; the cap furnishing means ofaccess to the orifice for cleansing purposes. The rear end of this tubeadjacent the orilioe 21 forms a mixing chamber and is provided with aseries of Vfour openings 25 to admit air. The central or burner portionof the tube is provided with a series of ten openings 26, three on thetop, three on each side and one on the under side. The tube 11 is formedwith two coils 11 through which the forward end of the tube 22 projects.

In operation after fuel has been placed in the cup 10 and the generatorparts heated, fuel is admitted from the tank 1 by opening the valve 15to the required degree, the fuel, in the form of gas, passing throughthe oriiice 21 into the mixing chamber where it is thoroughly mixed withair entering the openings 25 to provide a proper mixture. The fuelmixture thus formed being ignited both at t-he open forward end of thetube and at each of the openings 26 causes an intense jet of flame to beprojected through the open end of the tube as well as small jets offlame from the openings 26, one of the purposes of the small jets beingto retard the flame so as toV give the proper spot flame at the end ofthe tube, the combined areas of these openings 26 being suitablyproportioned to the cubic content of the burner tube to accomplish thisresult.

The pipe 11 being coiled about the burner tube 22 at the point where theheat is intense serves to heat the gasoline or other fuel beforeentering the generator, thus insuring a quick generation of gas, whilethe flame from the opening 26 in the lower side of the tube striking theextension 12 of the generator, serves to prevent cooling of thegenerator in cold or windy weather. The jets of flame from the balanceof the small openings 26 also provide heat for the tank, which is placedin close proximity to the tube 22 thus generating gas in the tank to anextent to maintain a constant steady pressure in the tank during theburning of the torch, thus eliminating the use of an air pump. i

Having thus described my invention, claim: Y ,Y y n l. ln a blow torch,a generator body'member, ay mixing and burner tube supported by saidmember, said tube having a plurality of flame jet openings between itsends, a fuel supply tube connected with said body member, and coiledabout said burnei1 tube, and a fuel tank supportedby said fuel supplytube in close proximity to'said vburner tube to effectively receive theheat of the flames from `saidflame jet openings.

2. n a blow torch, a generator body having a fuel passageway, a tubesupported by said generator body and communicating with said passagewaythrough a reduced orifice, a fuel Asupply pipe in communication with theother end ot said passageway and coiled about said tube, a fuel tanksupported by said pipe and communicating therewith, means for supplyingair to said tube at a ypoint adjacent said reduced ori lice, said tubehaving a plurality of flame jet openings, one at least of which is artheother of said tiame ranged to project a flame against a portion oi thedescribed fuel supply.

ln a blow torch, a generator body having a fuel passageway, a uel tank,a pipe connecting said fuel Vtank with one end of said passageway, atube supported by said generator body and communicating with the'otherend et said passageway through a reduced erilice, means for supplyingair to said tube adjacent said oriiice, said tube being formed with anouter open end and having a plurality 'of Vflame jet openings betweensaid open end and the air'supply means, one at least of said tiaine jetopenings being arrenged to direct a iiaine directly aainst the describediuel supply and jet openings arranged te supply heat to said tank, saidflame jet openings being further for the purpose ot' rctarding thei'laine'emitted from the open en@` oi said tube.

in testimony whereof, l have hereunto set my hand thisQBrd day oi' July,i928.

HERBERT L. FSH.

